Due to the preference of many consumers for natural compounds instead of synthetic ones in many foods vanilla extracts or vanilla capsules (beans) itself are used. The latter are much more expensive than the easily available vanillin deriving from lignin degradation or from synthesis. Therefore the risk of adulteration of vanilla extracts is high. Because of the complexity of the composition of vanilla the detection of adulteration is very difficult. The occurence of vanillin in nature, the description of the vanilla plants and the processing of vanilla, the chemical and physical properties and the complexitcity of vanilla extracts are treated in this report in addition to the description of the difficult detection of adulteration. Many methods for proof of authenticity of natural vanilla were developed in the past 10-20 years. The already existing methods described in the literature, their advantages and disadvantages concerning proof of adulteration are itemized in great detail. Due to the already large size of this comprehensive literature study our own results obtained by improved or new analytical methods will be given in Part 2 of this study
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